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Time to rethink our industrial civilisation (2)

Published 4 April 2018

From
Richard Mellish, London, UK

You quote Peter Styring on possible uses of carbon dioxide, saying: “I can take a slurry of calcium oxide, put CO2 into a bottle, shake it up and it'll react very quickly [to make calcium carbonate].” Yes; but how does he get his calcium oxide? It's made by heating calcium carbonate. This looks like a chemistry version of perpetual motion.